In a large bowl combine graham cracker crumbs, butter and sugar until moistened. Press firmly into 13x9 pan and refrigerate while preparing next layer.
In a large bowl beat cream cheese and powdered sugar until fluffy. Fold in 1 cup of whipped topping. Spread over graham cracker crust.
Top with sliced bananas and refrigerate while preparing next layer.
In a large bowl whisk together pudding mix and milk for two minutes. Pour over bananas. Top with remaining 2 cups of whipped topping.
Cover and refrigerate for at least 4 hours until set, preferably longer. Garnish with banana slices and/or graham cracker crumbs before serving, if desired.